Off-PeakThe period of low energy demand, as opposed to maximum, or peak, demand.
On-PeakA block of (usually 16) hours in each week-day when demand is at its peak. On-peak definitions for physical electricity vary by North America Electric…
Open AccessThe ability to send or wheel electric power to a customer over a transmission and distribution system that is not owned by the power generator (seller).
Open outcryWhen exchange-based commodities traders shout out their buy and sell orders or use a combination of words and hand signals to negotiate an order, it's…
Operating reservesThat capability above firm system demand required to provide for regulation, load forecasting error, equipment forced and scheduled outages, and local…